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प्रश्न
“First meiotic division is the reduction division” what does the word ‘reduction’ refer to in this statement?
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उत्तर
In this statement, reduction means that the number of chromosomes are reduced to half i.e. out of the 23 pairs of chromosomes in humans, only single set of chromosomes are passed on to the sex cells.
संबंधित प्रश्न
Chromosomes get aligned at the centre of the cell during:
A. Metaphase
B. Anaphase
C. Prophase
D. Telophase
What is the number of chromosomes in the gametes of human beings?
The component which is in the nuclei of cells and carries the hereditary characteristics is called ______.
Chromosomes are mainly made up of ______.
Choose the correct answer:
Chromosomes largely consist of _______________
Enumerate the various changes that occur in the nucleus of the cell during prophase.
Give a reason for the following:
Gametes must be produced by meiosis for sexual reproduction.
Give Reasons for the following
Chromosomes are the carriers of heredity.
(i) Draw a neat labeled diagram to show the metaphase stage of mitosis in an animal cell having ‘6’ chromosome.
(ii) How many daughter cells are formed at the end of mitosis and at the end of meiosis?
(iii) With reference to cell division explain the following terms:
(Chromatid, Centromere, Haploid).
(iv) Name the type of cell division that occurs during:
1. Growth of shoot 2. Formation of pollen grains.
3. Repair of worn out tissues.
Complete the following sentence with appropriate word :
Chromosomes are _________ material.
Name the following:
A specific part of a chromosome that determine hereditary characteristics.
Nullisomy is represented by ______.
The region of the chromosome where the spindle fibres get attached during cell division ______
Some of the chromosomes have an elongated knob-like appendages known as telomere.
Identify the TRUE statements with respect to aneuploidy.
- When the chromosome number is not the exact multiple of the haploid set, it is described as aneuploidy.
- Aneuploidy is only addition of one or more chromosome(s) to the total number of chromosomes in a cell.
- Aneuploidy is further classified as hypoploidy and hyperploidy.
Which of the following is TRUE with respect to the genes which inherit together during crossing over?
Differentiate between X-chromosome and Y-chromosome with reference to –
- length of non-homologous regions
- type as per the position of the centromere
A male gorilla has 48 chromosomes in each of its body cells. How many chromosomes will each of the sperms have?
After a mitotic cell division, a human female cell will have ______.
The female gamete/egg cell of a human cell will have ______.
